I’m sharing this to help others avoid a long troubleshooting cycle.

It took 27 days to identify the root cause of this issue.

System

Issue

Parts replaced by Dell (did NOT resolve)

Root Cause (confirmed)

The issue is caused by specific Dell-branded NVMe SSDs:

These SSDs trigger failsafe fan mode on the R770, likely due to NVMe telemetry or thermal reporting incompatibility.

Resolution

Recommendation

If you experience constant high fan speeds on an R770 with no thermal faults:

➡️ Verify the NVMe SSD model and firmware first.

Dell may need to review NVMe firmware compatibility or thermal policy handling for this platform.

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Power & Cooling